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1985'/z SOUTH BROADWAY <br />DAUB & ASSOCIATES, INCGRAND JUNCTION, CO 81507-9649 <br />(970) 254-1224 <br />FAX (970) 242-8438 <br />email: gjdaub@daubandassociates.com <br />www.daubandassociates.com <br />November 3, 2021 <br />Mrs. Amy Yeldell <br />Division of Reclamation, Mining and Safety <br />Attn: Minerals Division <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RECEIVED <br />NOV 0 82021 <br />DIVISION OF RECLAMATION <br />MINING & SAFETY <br />Re: Natural Soda LLC Nahcolite Project Permit No. M-1983-194 Proposed Groundwater <br />Sampling Modification <br />Natural Soda LLC (NS) plans on modifying the groundwater water quality sampling events in the <br />mining area. The proposed schedule would go into effect no later than January 1, 2022. The <br />proposed groundwater monitoring schedule maintains focus on the upper aquifers while <br />reducing sampling of the Dissolution Surface Aquifer. Attached, please find the "Groundwater <br />Monitor Well Sampling and Monitoring Schedule, 2021" for your review. <br />Please let me know if you have any questions as NS would like to implement this schedule as <br />early as December 2021. Thank you. <br />Should you have any questions or comments, please contact me at (970) 254-1224 or <br />(970) 216-1010 (c), or Kirk Daehling at (970) 456-1268. <br />Regards, <br />Gerald J. Daub, PG, CPG <br />President <br />Daub & Associates, Inc. <br />Cc: Kirk Daehling w/enc <br />President <br />Natural Soda LLC <br />James Roberts w/enc <br />Bureau of Land Management (WRFO) <br />File <br />SPECIALIZING IN PROFESSIONAL GEOLOGICAL, ENVIRONMENTAL, HYDROLOGICAL, GEOTECHNICAL AND PERMITTING SERVICES <br />